n.a tight-fitting garment of stretchy material that covers the body from the shoulders to the thighs (and may have long sleeves or legs reaching down to the ankles); worn by ballet dancers and acrobats for practice or performance
But for over 30 years, I've been putting in regular time at the ballet barre, dressed in a stretched-out unitard, baggy shorts or a gauze skirt, and a sleeveless men's T-shirt, accessorized with an elastic knee bandage.